The “Secretaria de educación pública” in Mexico created this site for teachers to have wonderful graphic organizers for their students. The site provides great explanations of the organizers along with rationale for using graphic organizers in the classroom. The graphic organizers are divided into several categories to make them more accessible to the teacher.

Create free-form graphic organizers online. You can drag your ideas
around in the organizer to arrange any layout and relationship that you
want. You can use circle or box (rectangle) shapes to appear on your
chart. Each layer on the chart will have a different color border for
the shapes that you choose.